As Cyprus is in the European Union, account for Cypriot residents belongs to the EU entity of IBKR (probably Ireland or Hungary, rarely Luxembourg).
For residents of non-EU countries, you would be registered with a different entity. Transfer between entities is not possible automatically. So you need to close your old account, transfer positions and open a new account (with another account number).
To activate your new account, you will probably need to provide a proof of address such as postpaid phone invoice or a bank account statement.